Pattern of Rebirth

Enchantment - Aura, 3G (4)
Enchant creature

When enchanted creature is put into a graveyard, that creature's controller may search his or her library for a creature card and put that card onto the battlefield. If that player does, he or she then shuffles his or her library.¹
Illus. Mark Brill

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: Searching for a creature card is optional. You can't go back and do it if you forget to do so, even if you normally do this.
• 10/4/2004: Because the "search" requires you to find a card with certain characteristics, you don't have to find the card if you don't want to.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (1/6)	Urza's Destiny (Rare)